Crystals typically found as brown to tan rhombohedrons in clusters, faces often curved or composites; more often found as medium to dark brown massive fine-grained material or as massive crystalline material with exposed curved cleavage surfaces.

Fungi like Lichenothelia may oxidize iron to produce siderite, which is then a biomineral (e.g., Burford et al., 2003).

Crystals usually rhombohedral {1011} or {0112}, often curved or with composite faces; also more rarely thin to thick tabular {0001}, prismatic [0001] with {1120}, or scalenohedral; most often found as massive material, either fine-grained in sedimentary settings or massively crystalline in metamorphic settings; may also be botryoidal or globular with a fibrous internal structure.

Twinning:

On {0112}, lamellar, uncommon, with translation gliding on {0001} or {1011}. On {0001}, rare.

An epimorph of Siderite after Barite collected in reasonable numbers in the 19th century from the Virtuous Lady mine in Devon and widely distributed in collections worldwide. How the Siderite managed to remain unaltered while the Barite was subsequently d...

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- This locality has map coordinates listed. - This locality has estimated coordinates.ⓘ - Click for further information on this occurrence.? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant.(TL) - Type Locality for a valid mineral species.(FRL) - First Recorded Locality for everything else (eg varieties).Struck out - Mineral was erroneously reported from this locality.Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.